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Photo: Ian Dugdale (iNaturalist) · CC BY 4.0 (May be cropped or resized)
Varanus dumerilii
Range
Southern Myanmar, Thailand, Peninsular Malaysia, Singapore, Borneo, Sumatra and neighbouring islands
Dumeril's monitor, also known as the brown rough-necked monitor, is a species of lizard in the family Varanidae, endemic to Southeast Asia. It is found in southern Myanmar and north of the Isthmus of Kra to Kanchanaburi Province in Thailand, as well as in Peninsular Malaysia, Singapore, throughout Borneo, Sumatra, Riau, Bangka–Belitung and other smaller islands (Wikipedia, general species account).